The way I read it is that there's a total of 10,000 £9 tickets across the season. This is for ANYONE with an L postcode, but they may need to register with the club if they are not already on the database.
In addition, there is a further 10,000 across the season at full price. This is another sale for members with an L Postcode only.
The £9 sale says there will be tickets for EVERY game, but the full price sale doesn't.
Whether either sale has the same amount of tickets available for each game remains to be see.